Control apparatus for reversible locomotives



April 27, 1948. 2,440,340

CONTROL APPARATUS FOR REVERSIBLE LOCOMOTIVES A. G. LARSON Filed June 21, 1946 2 Sheets-Sheet l O9 @QQ 3 J uwm. CQ WOQ FBQZ w w m HQ R2 0 g Q 30 :0230 256 mm N9 mvm SE06 59.56 m mcmmcu @Q 2 Mg m9 kw Ow m0 m 02 c, A\ mm mmam ::m N W .M @Q E 03 N3 M3 fl mm I 1 J Q QM o x w T lww WM D N O Ov I TQM. .rl mm. a? l U E A \M m: ME 8 fifi mm E n 3| @b I K w 3 3 QM. Ow QR. WA 0% a x mm f AW \d L R. mm Q 09 V m m Q @Q EW ON INVENTOR. Arihufi G. Larson AT TURBEY April 27, 1948. A. G. LARSON 2,440,340

CONTROL APPARATUS FOR REVERSIBLE LOCOMOTIVES Filed June 21, 1946 2 Sheets-Sheet 2 121 c 159 1 57 122 MQ'II'IE 5356- S1 3? 65 167 157 16? 1A1 [3?156) L ioJ 1 15e i65 i 166 168 140 l 164 11 l 29 165 56 L L w ii5 fl- 7 INVENTOR- Arthur G. Larson ATTORNEY Patented Apr. 27, 1948 CGNTRGL APPARATUS FOR REVERSIBLE LOCOMQTIVES Arthur G. Larson, Forest Hills, Pa, assignor to The Westinghouse Air Brake Company, Wilmerding, Pa., a corporation of Pennsylvania Application June 21, 1946, Serial No. 678,265

22 Claims. 1

This invention relates to control apparatus for reversible locomotives of the type employing generators operable by internal combustion engines for providing electric current to operate propulsion or traction motors for driving the locomotive.

One object of the invention is the provision of an improved control apparatus of the above type for controlling the speed of the internal combustion engine and the current supply to the traction motor or motors by operation of a single operators control lever.

Another object of the invention is the provision of an improved control apparatus of the above type so constructed as to prevent making or breaking the traction motor circuit during heavy current flow, as when the engine is operating above a chosen reduced speed.

Another object of the invention is the provision of an improved control apparatus of the above type embodying reversing means for carrying current from the generator to the traction motor but so constructed as to prevent said reversing means from either making or breaking the traction motor circuit during flow of current therein.

Other objects and advantages will become apparent from the following more detailed description of the invention.

In the accompanying drawings; Fig. 1 is a diagrammatic View partly in section and partly in outline of a control apparatus constructed in accordance with one form of the invention; Fig. 2 is a partial plan view of an operators control device shown in Fig. 1; Figs. 3 and 4 are sectional views taken on lines 3-3 and 4-4, respectively, in Fig. 1; and Figs. 5, 6 and 7 diagrammatic views of modifications of the invention.

Description-Figs. 1 to 4 As shown in the drawing, the reference numeral I designates an internal combustion engine, which may be of the Diesel type, and which is arranged to operate an electric generator 2 for supplying electric current to operate a locomotive propulsion or traction motor 3, the supply of current to said motor being by way of a switch device 5, and a motor reverser 6.

The propulsion motor 3 may comprise a motor armature i connected between a ground 8 and a lead 9 leading to the reverser 6, and a field coil it! connected by leads H and I2 to said reverser. The reverser B may have forward and reverse positions as indicated by lines and legends in the drawing. In the forward position of the reverser 6 contact l3 thereon connects the motor lead 9.

to the field lead 12, while a contact 14 connects the field lead H to a conductor l5. The switch device 5 is adapted to connect the conductor [5 to a conductor It, as will be later described, the conductor is leading to the generator 2. With the circuit just described closed and with the engine I operating the generator 2 current will be supplied from said generator to the traction motor 3 to cause operation thereof to propel the locomotive in a forward direction.

In the reverse position of the reverser 6 the motor armature lead 9 will be connected by a contact [I on the reverser, a wire I8 and another contact it to the field lead l I, while the other field lead i2 will be connected by a contact 2|] on the reverser, a wire 2! and another contact 22 to the conductor l5, so that with the switch device 5 connecting conductors l5 and I6 and with the engine loperating current will be supplied by generator 2 to the motor 3 to cause operation thereof to propel the locomotive in a reverse direction.

A fluid operated reversing motor 25 is provided for moving the reverser 6 to its forward and reverse positions. This motor comprises a casing containing two oppositely arranged pistons 2e and 21 connected for movement in unison by a rod 28. A member 29 connects the rod 28 to the reverser 6 whereby upon movement of the pistons 2e and 21 in the direction of the left hand to the position in which they are shown in the drawing the reverser 6 will assume forward position, while upon movement in the opposite direction to a position defined by contact between piston 25 and the right hand end of the casing the reverser will assume its reverse position. At the outer face of the reverser piston 26 is a pressure chamber 3U connected to a forward pipe 3|, while at the opposite face of piston 21 is a pressure chamber 32 connected to a reverse pipe 33. Between the pistons 26 and 21 is a non-pressure chamber 24.

In operation, when fluid under pressure is supplied to the forward pipe 3| at a time when the reverse pipe 33 is open to atmosphere, in a manner which will be later described, the reversing motor 25 will move the reverser 6 to its forward position, while upon supply of fluid under pressure through pipe 33 to piston chamber 32, when piston chamber 30 is open to atmosphere through the forward pipe 3i, the reversing motor 25 will move the reverser B to its reverse position.

The engine I has a rockable shaft 35 for varying the amount of fuel supplied to said engine to thereby vary the speed or power output of the engine, in any conventional manner. A lever 36 is connected to shaft 35 for turning it to different positions, said lever and shaft having an idle position, in which they are shown in the drawing, a stop position at one side of said idle position for cutting off the supply of fuel to said engine, and a maximum fuel position at the opposite side of said idle position, adjustment of said lever between the idle and maximum fuel position being adapted to provide for operation of the engine at any desired degree of speed or power output for in turn causing a corresponding electric output from the generator 2. The stop, idle, and maximum fuel positions are indicated in the drawing by dot-dash lines and suitable legends.

For adjusting the fuel control lever 36 a fluid motor 33 is provided which comprises a casing containing a movable abutment preferably in the form of a flexible diaphragm 39 which is clamped around its edge in the casing. At one side of diaphragm 39 is a pressure chamber 40 connected to a speed control pipe 41, while at the opposite side of said diaphragm is a non-pressure chamber 42. A rod 43 extending through the nonpressure chamber 42 has one end connected to diaphragm 39 centrally thereof. The opposite end of rod 43 is disposed outside of the casing and is connected to a lever 44 one end of which is pivotally connected to one end of a link 4'5 the opposite end of which is pivotally connected to the casing of the device. The opposite end of lever 55 is adapted to be connected by a link 46 to the free end of the fuel control lever 38 on the engine l. S-lidably mounted on rod 33 within the non-pressure chamber 42 is a spring seat l'i having at one end an outturned annular flange 53 adapted to contact the casing around the opening through which said rod extends for connection with the lever 44. Interposed between the flange 48 and a head 49 on rod 43, which head engages one side of the flexible diaphragm 34, is a control spring 50 which is of the coil type encircling said rod. At the opposite end of spring seat ll is an inturned flange arranged to be engaged by a ring or collar 52 secured to the rod 433 for limiting movement of said seat in a direction away from the diaphragm 39. The spring 53 is interposed between the rod head 49 and flange G8 in the spring seat 41 under such compression as to require a chosen pressure of fluid, such as 15 pounds, in diaphragm chamber '40 for initiating movement of said diaphragm against the force of said spring when flange 48 on the spring seat t! is in contact with the casing, in which position it is shown in the drawing.

With the parts of motor 38 in the position in which they are shown in the drawings the fuel control lever 35 on engine I will be in its idle position. Upon an increase in pressure of fluid in pressure chamber Ml above the chosen degree just mentioned, the diaphragm 39 will move against spring 50 to actuate lever 44 for moving the fuel control lever 35 out of idleposition in the direction of its maximum fuel position, the degree of movement of the fuel control lever 36 out of idling position corresponding to the increase in pressure in pressure chamber 40 above the chosen degree above mentioned. When a chosen maximum pressure of fluid is provided in diaphragm chamber 4% the fuel control lever 36 will assume its maximum fuel position.

The diaphragm 39 and rod 43 are also movable from idle position, in which these parts are shown in the drawing, in an upwardly direction for pulling the fuel control lever 35 to its stop position,

in which position a head 54 mounted on said diaphragm in chamber 49 will contact a stop 55 in the casing. When the diaphragm 39 and rod 53 are thus moved to stop position as defined by stop 55, the collar 52 on rod #33 engaging flange ii! on the spring seat 47 will move said seat and the control spring 5% with said diaphragm, as will be apparent.

For moving the flexible diaphragm rod 3 and levers 44 and 36 to their stop position, a flexible diaphragm 57 is clamped in the casing around its edge and is operatively connected to rod 53 through the medium of a rod 53 having a follower 5t contacting said diaphragm, and a lever 59 connected at its opposite ends to rods 43 and 53 and fulcrumed intermediate its ends on a pin 60 carried by an arm 6% projecting from the casing. At one side of diaphragm 5! is a pressure chamber 32 which is open to a fuel cut-off pipe 83, while at the opposite side is a nonp-ressure chamber 54 containing a bias spring acting on the diaphragm follower 5-5. When the fuel cut-off pipe 63 and diaphragm chamber 62 are open to atmosphere, in a manner which will be later described, the spring 53 will actuate the diaphragm follower 55, rod 53 and lever to move rod 43 to the position in which flange :8 on the spring seat 4! contacts the casing. Upon operation of diaphragm 39 to move the fuel control lever 33 out of idle position in the direction of maximum fuel position the diaphragm 5? will move with said rod under the pressure of bias spring 65. However when diaphragm 55% is in its idle position and pressure chamber dd is open to atmosphere and fluid under pressure is supplied through the fuel cut-off pipe 63 to the diaphragm chamber 62, the latter pressure acting on diaphragm El will actuate rod 58, lever 58, and rod 43 to move diaphragm 39 to the position defined by contact of the diaphragm head 54 with stop 55, for thereby pulling the fuel control lever 35 to stop position.

The forward and reverse pipes 35 and 33 and the speed control pipe H are connected to an operators control valve device iii which may be substantially like that disclosed in Patent 2,388,- 357 issued to Ellis E. Hewitt on November 6, 1945. Since reference may be had to this patent the disclosure of the operators control device in the drawing has been limited and the description thereof will hereinafter be likewise limited to only that deemed necessary to a clear understanding of the invention.

Briefly, the operators control valve device 79 comprises a casing containing two selector valve devices H and 12 for controlling the supply and release of fluid under pressure to and from the forward and reverse pipes 3| and 33, respectively, and a self-lapping valve device 73 for controlling the supply and release of fluid under pressure to and from the speed control pipe ii.

The selector valve devices H and i2 are both identical in construction each comprising a plunger 74 and valve means (not shown) which are operable when said plunger assumes a position in which it is shown in the drawing to open the respective pipe 3! or 33 to atmosphere. Upon movement of plunger id into the device the valve means is adapted to operate to supply fluid under pressure to the respective pipe 3i or 33 from any suitable source such as a fluid pressure supply pipe 75.

The self-lapping Valve device 73 may be of any suitable structure embodying a control member or plunger 75 which is operative upon downward movement from a normal position in which it is shown in the drawing to effect operation of valve means (not shown) to supply fluid to the speed control pipe 4! at a pressure depending upon the extent of such movement, and to open said pipe to atmosphere in said normal position.

A rock shaft l'l disposed above plunger 16 is journaled in the casing in two spaced bearings 18 and 19. A cam element 89 is secured on shaft 11 between its two bearings by means of a set screw 8|, said element substantially engaging the adjacent ends of the two bearings for holding said rock shaft against longitudinal movement. At the side adjacent plunger 16 the cam element 80 has two like and oppositely arranged cam surfaces 82 joined by a recess 83 provided to receive one side of a power transmitting member 84 the opposite side of which is in contact with plunger 16. When the cam element 861 is positioned for recess 83 to receive the member 84 the control member or plunger 16 in the self-lapping valve device 13 will occupy its normal position to provide for opening of the speed control pipe M to atmosphere. Rotation of rock shaft H and thereby of cam element 80 in either direction from this normal position will move plunger 16 in a downwardly direction for actuating the selflapping valve device 13 for supplying fluid to the speed control pipe 4| at a pressure proportional to the extent of such movement.

Opposite the recess 83 the cam element 86 has two spaced parallel arms 85 between which extends one end of an operators control lever 86. A bolt 81 extends through the two arms 85 and the lever 86 to provide for rocking movement of the lever in the cam element lengthwise of the rock shaft ll. Movement of lever 86 circumferentially of the rock shaft Ti will actuate the cam element 80 for controlling the self-lapping valve device 13.

The rock shaft 11 is provided with an axial bore in which is slidably mounted a plunger 88 having a slot 89 aligned with a slot 96 through one side of said shaft. The inner end of the operators control lever 86 extends through the slot S and into slot 89 and within shaft 71 is connected to plunger 88 by means of a pin 53! secured to said plunger. Rocking of lever 85 in either direction from a neutral position shown, lengthwise of the rock shaft Tl will thus move plunger 88 in the direction of its length.

The plungers M of the two selector valves H and T2 are adapted to be engaged by opposite ends of a lever 92 which is fulcrumed at its center on a pin 93. The lever 92 has an extension 94 the end of which is in the form of a yoke 95. The two parts of this yoke are disposed at opposite sides of plunger 88 in an annular groove or recess 96 therein whereby the lever 92 will be rocked upon movement of plunger 88 in either direction from a normal or neutral position in which it is shown in the drawing. With plunger 35 in the normal position, and thereby with lever 92 in its normal position in which it is shown in the drawing, the two plungers M of the selector valve devices H and i2 will occupy the position shown for opening the forward and reverse pipes 39 and 33, respectively, to atmosphere.

A cover Ill?) secured to the casing of the manually operative control device is provided with a slot l0! in which the operators control lever 65 is arranged to move for controlling the sequence of operation of the selector valve devices it and i2 and of the self-lapping valve device 13. The slot l0! comprises a central portion Hi2 providing for movement of the operators control lever 86 lengthwise of the rock shaft H for controlling the two selector valve devices I! and '12 while retaining the rock shaft 11 in a neutral position providing for operation of the self-lapping valve device 73 to maintain the speed control pipe 4| open to atmosphere. Movement of the operators control lever 86 toward the right hand from neutral position will move plunger 88 in the direction of the left hand for thereby actuating lever 92 to move plunger M in the selector valve device H into said device while permitting plunger 14 in the selector valve device 12 to remain in its normal position in which it is shown in the drawing, whereupon fluid under pressure will be supplied to the forward pipe 3| while the reverse pipe 33 will be open to atmosphere. On the other hand, movement of the lever from its neutral position in the direction of the left hand will move plunger 33 in the direction of the right hand for operating the selector valve device 12 to supply fluid under pressure to the reverse pipe 33 while permitting the selector valve device H to maintain the forward pipe 3! open to atmosphere. This operation of the two selector valve devices 1| and 12 to supply fluid under pressure to pipes 3| and 33 will be obtained, at respectively, opposite ends of the portion I82 of the slot I 0|.

At the right hand end of the portion I02 of slot Nil the operators control lever 86 may be moved at right angles into a portion I03 of said slot for thereby rocking the rock shaft H for actuating the self-lapping valve device 78 to supply fluid to the speed control pipe il at a pressure proportional to the extent of movement away from the portion I52. At the opposite end of the portion H32 of slot Hi the lever 85 is movable into a right angular portion m4 for actuating the rock shaft ll in the opposite direction to effect, however, the same operation of the self-lapping valve device E3 to provide fluid to the speed control pipe ll at a pressure proportional to the extent of movement away from the portion I82 of the slot. In the portion ill: of slot M3! the selflapping valve device is adapted to open the speed control pipe ll to atmosphere. At each of the opposite sides of the central portion 5B2 of the slot there is a position designated in the drawing by the legend switch closed in which the self-lapping valve device l3 will provide fluid in pipe 4! at a certain chosen pressure, such as 15 pounds.

fhe operators control device further comprises interlock means consisting of a finger Hi5 which is arranged to move into the path of movement of lever 86 through the central portion N2 of slot Iii! for preventing said lever from being moved from one end of said portion of said slot to the opposite end for a certain period of time. The finger I05 is provided on one end of a. member 15 which is rockable about a pin Ill! secured in the cover said member being provided with a slot N33 to allow a certain movement of said member relative to said pin in order to permit movement of the operators control lever 85 substantially to its neutral position upon engagement of finger E35 witheither side of said lever. A spring H39 having one end anchored to cover lilii is connected under tension to member 9% for pulling said member out of the path of movement of the operators lever 86. For moving the finger E35 into the path of movement of the operators control lever there is provided a movable abntment, preferably in the form of a flexible diaphragm H9, which is clamped around its a eco eao its connection with the self-lapping valve device Connected to. the speed control pipe 41 is a pneumatically controlled switch device 55 which comprises. a casing containing a piston Hi5. side of piston HE is a pressure chamber i, l l which is open to. the speed control pipe ll while at the opposite side is a non-pressure chamber H8 containing a, spring i i9 acting on the piston E it; with a fencev which requires a chosen pressure of flu-id, such as 10. pounds, in the speed control pipe ll and in the pressure chamber ill to move said piston against said spring out of a normal position in which said piston is shown in the drawing. A rod 20 has one end connected to the piston H6. The rod Iii-1 extends to the exterior of the casing, and connected to its outer end is a movable switch contact l2l adapted to. bridge two stationary contacts I22 for connecting an electrical conductor [23 to an electrical conductor ill-dv leading to. a, magnet 25 of an electro-magnet valve device lift.

The electro-magnet valve device 226. comprises a casing having a chamber l2? connected to the switch device 5 and. a chamber i123 connected to a fluid pressure supply pipe. I29. A valve lfiil contained in chamber 123. is provided for controlling flow of fluid under pressure from chamber 23 to. chamber [2! and thence to the switch device 5.. The valve I36 is connected by a stem to. an oppositely seating valve ltl arranged to control communication between chamber iii and atmosphere. The. magnet l25 comprises a solenoid i 32 connected to. the. valves lti and i739 and encircled by a magnet coil connected to conductor it d. Upon energization of magnet E5. the valve 53E will be closed and the valve E39 will be open, while. upon deenergization of said magnet a spring L33. acting on valve It!) is adapted to seat said valve and to unseat the valve I31.

The switch device 5, may for the purpose of illustration, be identical to, the switch device tic except for the control spring H9 therein which may allow operation of the switch device 5,- by, a lower pressure of fluid in pressure chamber til than is required to operate the switch device l E5. The movable contact E25 of the switch device 5 is adapted to. bridge two fixed contacts E3 for electrically connecting the conductors. l5 and 55 from the motor reverser 6 and the generator 2.

Two conductors I35, and I65. supplied with electric current from any suitable source, such as a battery I31 lead to the motor reverser 6 which is provided with a, contact {3 8 for, in the forward position of said reverser, connecting the conductor L35 toa conductor l 39. In the reverse position of the motor reverser 6 the conductors i3t and i258 are connected together by a contact I48 on the reverser, a wire M! and a contact [.42. The conductor ltd is adapted to be con nected to conductor I23 by a manually operable switch M3,.

The fluid pressure supply pipe 55 and fuel cut off pipe 63 are connected to a manually operable valve I45, and also connected to said valve is a lipid pressure su ply pipe its which may be constantly supplied with fluid under pressure from any suitable source. The manually operable At one valve device I45 comprises a casingin which is mounted a rotatable valve I41 adapted to. be turned by a handle I48 from a normal position in which it is shown in the drawing to, an engine stopping position indicated by the dot-dash line M 9. The valve I41 has two oppositely arranged cavities I58 and I55, the cavity l5| establishing communication between the fluid pressure supply pipe I46 and pipe 15 while the cavity I50, connects pipe 63 to. an atmospheric ventI l5.2, when said valve and handle Hi8. are in the normal position. In the other position of valve 141 in which the handle I 48 will be disposed in the position indicated by the dot-dash line 149 the cavity 15.! will connect pipe 15 to the atmospheric vent 152, while cavity 559 will connect pipe 63 to the. fluid pressure supply pipe M6,. The fluid pressure supply pipe I29 connected to the electro-magnet valve device I26 may be connected to the fluid pressure supply pipe l5l.

Operation-Figs. 1 to 4 In operation, let it be assumed that initially the manually operable valve M5. is in the position in which it is shown in the drawing for establishing a fluid pressure supply communication between pipes I it and i5 and for opening the engine stop pipe 63 to atmosphere. Let it further be assumed that the operators control lever 88 is in neutral position opening the. forward and reverse pipes 3i and 33 and the speed control pipe ii, and thereby the diaphragm chamber H2 in the operators control valve device, to atmosphere.

With diaphragm chamber H2 open to atmosphere spring i519 will operate member [06 to draw finger m5 out of the path of movement of the operators control lever 86. With the forward and reverse pipes El and 33 open to atmosphere fluid under pressure Will be vented from chambers 30 and 32; in the reversing motor 25, and let it be assumed that pistons 26 and 2.? therein and the motor reverser 5 are in their forward positions as shown in the drawings. With the speed control pipe 41 open to atmosphere diaphragm chamber 69 in the. fluid motor 33 will be open to atmosphere and with diaphragm chamber 62 in said motor also open to atmosphere through the manually operable valve M5 the parts of said motor will assume the position in which they are shown in the drawing for positioning the fuel control lever 3'5 on the engine in its idle position, and let it be assumed that said engine is operating at idling speed driving the generator 2 at a corresponding speed.

With the speed control pipe il open to atinosphere the switch device H5 will be opening the circuit between conductors 23 and H26, and the magnet I25 of the electro-magnet device $25; will be deenergized permitting spring I33 to seat valve I 38 and to open valve I3| for thereby opening diaphragm chamber H7 in the switch device 5 to atmosphere, so that the switch 52! of said device will be in its circuit opening position connecting the conductors I5 and 16.

Le it now be assumed that the operator desires to move the locomotive in a forward directipn. To accomplish this he will move control lever to the right hand end of the central portion it}? of slot ill! for effecting operation of the [forward selector valve device H to supply fluid under pressure to pipe 3! and thencev to. piston chamber 39 of the reversing motor 25. With the pistons 26 and 2'!v of the reversing motor already in their forward position the supply oi fluid under pressure to chamber 33 will be withouteiiect,

, but it is desired to point out that with the motor reverser 6 also in its forward position electric current will be supplied from battery I31 through wire i35, contact I38 on said reverser and conductor I33 to the manually operable switch I43, and assuming that said switch is closed said conductor will be connected to the conductor I23.

The operator may now move lever 83 from the right hand end of the central portion I32 of the slot IEiI into the portion Hi3 of said slot and prior to obtaining the switch closed position therein, the self-lapping valve device lt will be operated by said lever to supply fluid to the speed control pipe 5| at a pressure suiflcient to actuate the switch device I I5 to close the circuit between conductors I23 and I2 5. Electric current from battery I3] will then be supplied to the magnet 525 for effecting energization thereof.

Energization of magnet I25 will seat valve i3i and open valve I351 whereupon fluid under pressure from the supply pipe I29 will flow past valve see to chamber I27 and thence to switch device 5 for operating said switch device to electrically connect the conductors I5 and I3 which connects the traction motor 3 thru the reverser 3 to the generator 2.

The speed control fluid motor 38 will remain in its idle position until after the operators lever 3! is moved past the switch closed position in the portion W3 of slot Iiil, whereupon a sufficient pressure will be obtained in diaphragm chamber 33 of said motor to deflect the diaphragm 33 against the opposing force or control spring 50 for thereby actuating lever 14 to move the fuel control lever 35 out of its idling position in the direction of its maximum fuel position for accelerating the engine I and generator 2 for increasing the electrical output of said generator and thereby the supply of electric current for driving the traction motor 3. By suitable adjustment of the operators control lever between the switch closed position and the full speed position in the portion i533 of slot IiiI any desired degree of speed or power output of engine I between idling and maximum may be obtained and a corresponding output of the generator 2 will result for operating the traction motor 3.

When fluid under pressure is supplied to the speed control pipe GI as above described it will also flow through choke H3 into diaphragm chamber I12 in the operators control valve device it and therein act on diaphragm Hi] to actuate member I36 to move finger I05 into the path of movement of the operators control lever 83 through the central portion H32 of slot IIlI. Let it now be assumed that the operator desires to change the direction of movement of the locomotive from forward to reverse. To accomplish this he will move lever 83 from whatever position it may be in in the portion I33 of slot ill! back to the portion I32 of said slot and into engagement with the finger I35. When the lever 86 thus engages the flnger I235 said finger will move in the direction of the left hand due to the slot I38 in member I36, to permit said lever to be moved to its'neutral position and fluid under pressure will be released from the speed control pipe M and from the forward pipe 3 I, the reverse pipe 33 bein open to atmosphere at this time the same as when the locomotive was operating in a forward direction.

When the pressure of fluid in the speed control pipe il becomes reduced to the chosen pressure (15 pounds) above mentioned the parts of the fluid motor 38 will return to their idle position to permit the fuel control lever 36 on engine I to move to idle position to permit reduction in the speed of said engine to idling speed and to permit a corresponding reduction in the output of generator 2. When the pressure of fluid in speed control pipe 41 then becomes further reduced to the chosen lower degree, such as the 10 pounds above mentioned, the switch device i 55 will operate to open the circuit through conductors !23 and H24 for cutting off the supply of electric current to magnet I25, whereupon spring I33 in the magnet valve device I23 will close valve I39 and open valve ISI for releasing fluid under pressure from the switch device 5 to permit operation thereof to break the circuit between conductors I6 and is for cutting off the supply of electric current to the traction motor 3.

When the speed control pipe 4| is opened to atmosphere upon return of the operators control lever 86 to neutral position as above described, the fluid pressure in diaphragm .chamber H2 in the operators control valve device will be gradually vented through the choke H3 to said pipe and thence to atmosphere, and after a certain time interval, suflicient to insure opening of switch device H5 and in turn operation of electro-magnet device I26 and thereby of the switch device 5 to break the traction motor circuit through conductors I6 and I5, the pressure of fluid in diaphragm chamber II2 will become reduced to a degree suificient for spring I39 to move finger I35 out of the path or movement of the operators control lever 83. The operator will then move lever 86 to the left hand end oi the portion I02 of slot IUI.

When the operators control lever 36 is moved to a left hand end of the portion I92 of slot IilI it will operate the reverse selector valve device I2 to supply fluid under pressure to pipe 33 and thence to piston chamber 32 in the reversing motor 25. The fluid pressure thus provided in the reversing piston chamber 32 will then actuate piston 21 to move said piston and the piston 25 and thereby the motor reverser 6 to reverse position for reversing the field connections of the traction motor 3 and for also breaking the connection between the battery conductor I35 and conductor I39. The battery I31 will be then maintained disconnected from conductor I39 until the reverse position of the motor reverser 6 is obtained whereupon the battery will be reconnected to said conductor and to conductor I23 as before described. If the operators control lever has been moved into the portion I34 of the slot IOI, then as soon as the pressure of fluid in speed control pipe 4| is increased to the chosen degree (10 pounds) above mentioned the switch device II5 will move to its circuit closing position for supplying current from battery I31 to magnet I25 to effect energization of said magnet for closing valve l-3I and for opening valve I30. Fluid under pressure will then be supplied past Valve I30 to the switch device 5 for effecting operation thereof to close the traction motor circuit between conductors I6 and I5. Movement of lever 86.past the switch closed position into the portion I04 of the slot IUI will then cause operation of the speed control fluid motor 38 to cause acceleration of engine I to increase the power output of the generator 2 for causing operation of the traction motor 3 to propel the locomotive in the reverse direction at a desired speed.

With the locomotive operating in reverse, pressure of fluid in the speed control pipe will become ll effective in diaphragm manner I 12 or the operators control device to move finger I35 into the path of movement of lever 86 thru the central portion I or of slot Iiii past its neutral position.

To change the direction of movement of the locomotive from reverse to forward, the lever 86 may now be moved out of the portion Hit of slot IEI into the portion W2 and into engagement with finger 85 which, due to slot IE8 in the member 585, will give to allow movement of said lever to its neutral position no thereby opening the speed control pipe 4i and the reverse pipe 33 to atmosphere for releasing fluid under pressure therefrom. As the pressure of fluid in the speed control pipe tl is reduced the speed control fluid motor 38 will first operate to move the fuel control lever 36 on the engine to idle position to permit reduction in speed of said engine to idling and a corresponding reduction in output of the enerator 2, followed by op ration of the svvitch device I l5 to open the circuit controlled thereby. The magnet I25 Will thereby be deeiiergi ied to permit closihg or valve I31; and opening of valve ISI ror 'ventihg fluid tinder pressure from the switch device 5 whereupon said device will 01)- erat t6 hieek the traction motor cireiiit between conductors l5 and I6. t

With the operators coht i'bl lever 83 in heiitiaI po'sitioh fluid uhdei' pressure will be grauuau'y released aiaohragm chaihber H2 i1 1 said device to atmosphere through choke I13 and pipe, 2-], ans after a period or time sfifi'i i ht to ihs ui' operation 'of switch H5 and manor of the electr'o-ihahet Zievie I26 and. switch 5 to hben the traotioh fnotoi ciruit between con uctors afitl I5, the pressure of fluid in said chamber will be- (some sunieienuy remote to hermit spr ng its to o erate member TUB toineve finger I05 Gut or the earner movement of lever '86 t rough the poi'tioh Iii 2 or slot 'l tli. Theleve'rtt ma then be ihdvdtl the right h lhd end of poitioh 'IUZ of slot WI for 'theieh'y actuating the forward selector valve aevise' 71 t 51151515 fluid iifidei pressure the foivvaitl piio'e to piston chairiber 30 iii the rverl'sih motor "25. The reversing motor Will theh 'operate as before 'de s crihed to move the r re'versr 6 its reverse position to its forward posi on to condition the tiactron motor 3 'for operation in "a forward direction and for also reconnecting the battery conductor 535 to the conductor I and thehce -tlfiru the closed switch I43 to connector I 23'. Movement 0f the ooeratorscontm lever 85 into the portion I 63 'o'f'slotfifil'i will then c ejil'se operation of stv itch device I 55 to effect energi'zotion of eieotromagnet device I26 and thereby operation of the switch'devioe to close the tia ctiol'i motor circuit through wires 55 and I5, and then the Speed control fluid motor 38 will be operated to accelerate the engine 'I to a degree corresponding to the position of 'the'o'prators control lever beyond the switch closed position in the portion I03 of slot me, for in turn 'efiecting a corresponding increase in any output of power from generator 2 for operating the traction motor 3 to drive the locomotive forwardly.

In order to cut off the supply of current to traction motor 3 for stopping the locomotive from movement in either direction it is only necessary to move the operators control lever 86 into the portion iez or slot I6! for opening the speed control pipe iI to atmosphere whereupon the speed control motor 38 vvillop'erateto reduce the speed of the engine'to idling for correspondihglv reducin the power output fibi'h generator i2 7 2, followed by operation of the switch device H5 to open the circuit to the electr c-magnet dvie H253 to cause operation of the switch device 5 to open the traction motor ciiciiit between cond'uc tors I5 and I6.

From the above description it will now be seen that when the operator desires to reverse the direction of movement of the locomotive the ringer m5 acting to prevent movement Of the 1ever 36 past neutral position insures operation first of the s eed control motor 33 to idling position to peiihit reduction in speed or the engine to idling with a correspondin reduction in output of generator 2, and then operation or the switch device H5 or the elective-magnet device I26 and switch 5 to open the traction motor Circuit th'ru conductors i5 and it before operation of said lever is permitted to cause operation of the reversing motor 25 and motor reverser 6 to reverse the connections to the traction "motor field Iii. Further, as soon as the finger N35 is pulled from the path of movement or lever 86 and said lever is moved to the opposite end of the portion IE2 of slot I01 and then into the portion [ms or lot, as the case may be, the motor reverser '6 immediately starts to move out of whichever position it is in toward its other position, and as soon as it starts to move it breaks the connection between battery I 3? and conductor I39 and maintains this connection broken until the reversing movement is Completed. Thus if, in reversin the lobemotive the lever 86 is moved at a normal rate from neutral position into the portion I113 0r I04 of the slot iei, as the "case may be, and fluid is supplied to the speed control pipe M at a pressure to operate the switch device II 5 to its circuit closing position, operation of the switch device 5 to close the traction motor circuit will be ositively prevented until after the motor reverser obtains the position to which it is being moved for connecting the battery I31 to the conductor I39 following which the switch device 5 will operate to close the traction motor circuit.

The switch device 5 thus opens the traction motor circuit before the motor reverser '15 opens its circuit contacts and said reverser closes its circuit contacts ahead of the switch device 5, so that said reverser is not required to either make or break said circuit during current flow to the traction motor 3. The contacts in the motor reverser '6 need therefore be only of ample size to carry current for operating the 'motor 3, since the motor'circu'it is never broken by said contacts during now of current.

"Opening of the manually operable 'svvit'ch l''3 will permit operation of engine I "at "any desired speed without causing operation o'fthe traction motor '3, since under such a 'o'o'nditioh the switch device 5 W131 maintain the tratio'n fnbtoi ii fiit open, and this is desirable u'iide'r certain conditions as for "exam le to permit warming lip 6f the engine or to permit use or said engine, for Operating auxiliary apparatus such as an air compressor (not showh) for charging ah air supply system on the locomotive Without moving the locomotive.

If handle IE8 or the manually operable valve device 'l ifi 'is'opera'tedto turn the valve I47 to the position indicated by dot-dash line M9; the fluid pressure supply pipe I5 will be open to atmosphere through vent port I52 "for thereby cutting oh the supply of fluid under pressure to the operators control valve device it so as to prevent suep'iy'or fluid to the speed control liuid motor 38 and to the 'r'everser motor 25, whereby operation or the locomotive will e positively prevented under a conditon, where, for example, it is desired to work on the locomotive. If the stop pipe 63 is also controlled through the manually operative control device I65, it will be open to the fluid pressure supply pipe M when the fluid pressure supply pipe i5 is open to atmosphere for thereby providing fluid under pressure in diaphragm chamber 52 of the fluid motor 38 for actuating said motor to move the fuel control lever 36 on the engine I to its stop position to cause stopping of the engine while the locomotive is being worked on, if such is desirable.

Description Fig. 5

If desired, the switch contacts I38, Iii? and I42 in the motor reverser 6 may be dispensed with and the conductor I39 may be connected directly to battery I31, and a double check valve device I53 may be associated with the reversing motor 25, as shown in Fig. 5 of the drawing, for accomplishing the same result as obtained by use of said contacts in the structure shown in Fig. 1.

The double check valve device I53 comprises a casing containing a double check valve I54 arranged to control communication between pipes I55 and I55 connected to opposite ends of said device and pipe I29 from the electromagnet valve device I26. In the position of the double check valve I54 in which it is shown in the drawing it opens communication between the pipe I55 and a passage I5; in the casing while closing communication between said passage and pipe I56, while in an opposite position said check valve will close communication between said passage I51 and pipe I55 and open said passage to pipe I55. The passage I51 is connected to the fluid pressure supply pipe I29 leading to the electromagnet valve device I26. The pipe I55 is so connected to the reversing motor 25 as to be open to pressure chamber 35 only when the reversing piston 26 is in its forward position, in which it is shown in the drawing, and to at all other times be open to non-pressure chamber 24 formed between the two pistons 26 and 21. The pipe I55 is adapted to be opened to pressure chamber 32 only when piston 2'! and the motor reverser 6 are in the reverse position and at all other times pipe I55 is adapted to be opened to the nonpressure chamber 2'4.

By this arrangement when the operators control lever 55 is returned from either the portion I03 or I94 of the slot IGI to its neutral position for venting chamber 35 or 32 in the reversing motor 25, the supply of fluid under pressure to the electro-magnet device I25 thru pipe I29 will be cut off and will then be maintained cut-ofi until after the reversing motor 25 operates to position the motor reverser E in accordance with the operation of the operators control lever 86, so as to thereby insure against supply of fluid under pressure to operate the switch device 5 for closing the traction motor circuit until after the motor reverser 6 obtains the position corresponding to that of the operators control lever 85.

Description Figs. 6 and 7 In both of the structures disclosed in Figs. 1 and 5 of the drawings, there is a possibility of causing the switch device 5 to be moved to its circuit closing position before operation of the motor reverser 5 occurs to reverse the electrical connections to the traction motor 3 under which condition the motor reverser would break the circuit between the generator 2 and said motor which is contrary to intended operation and undesirable for it will result in burning or the con tacts in the motor reverser.

The unintended operation of the apparatus, just described, will not occur if the operators control lever 86 is moved at a normal rate, and can result only if said lever is moved at an abnormal rate from one position to another. For instance if the lever I35 is in neutral position following operation of the locomotive in a forward direction and is moved at an abnormally rapid rate to at least the switch closed position in the portion I54 of slot IDI, there is a possibility that the switch device 5 may move to its circuit closed position before the motor reverser 6 starts to operate. The motor reverser 6 when it starts to operate will then have to break the circuit between generator 2 and the traction motor 3. The possibility of this occurring is even greater if the lever 86 is in the portion I02 of slot IEII at the junction with portion I63 and is flashed from this position to the switch closed position in the portion Hit f said slot, for under such a condition operation of the reversing motor by fluid under pressure supplied to the reverse pipe 33 will be delayed until the fluid under pressure is reduced in the forward pipe 3%. The undesired operation just described may also occur upon flash operation of lever to change the direction of operation of the locomotive from reverse to forward, as will be clear without a detailed description herein.

In order to positively prevent operation of the switch device 5 to its circuit closed position prior to operation of the motor reverser 6, and to also ensure that said device will remain in its circuit opening position until after said motor reverser has completed its movement and thereby prevent the undesired operation above described, regardless of how the operators control lever 88 is moved, the apparatus shown in Figs. 1 and 5 of the drawings may be modified in the manner shown in Figs. 6 and '7, respectively.

Referring first to the modification shown in Fig. 5. According to this modification there is added to the equipment two switch devices I59 and IE6 arranged to be controlled by pressure of fluid in the forward and reverse pipes 31 and 33, respectively, for controlling in series with the motor reverser 6, the manually operative switch I43 and the switch device H5, the circuit thru iinagnet I25 of the electro-magnet valve device Ihe two switch devices I59 and IE8 are of identical structure and each may comprise a casing containing a piston IBI subject on one side to pressure of fluid inv a pressure chamber I62 which is open to the respective ahead pipe 3| or reverse pipe At the opposite side of piston IEI is a non-pressure chamber I63 containing a spring I5 acting on the piston in opposition to pressure of fluid in chamber I62. A rod I55 projecting from piston I64 carries outside of the casing a movable contact I65 arranged to electrically connect two fixed contacts I61. The battery I3? is connected to one of the fixed contacts I51 at each of the switch devices I59 and I60. At the switch device I59 the other contact I6! is connected to conductor I35, while at the switch device Hi9 the other contact IIS'I is connected to conductor I35.

In each of the switch devices I59 and I59 the piston IiiI will move the contact IE6 into circuit closing relation with the fixed contacts I61 when the pressure of fluid in chamber I52 exceeds the opposing pressure of spring I64 and will move 15 contact 1 6'6 but i of circuit nosin relation with contacts 161 when the-pressure Gi fiuidis reduced to "below that of can spring "The pressure of spring 1 64 on piston [Si is suchas --to require an iric'zr'ease in pressu're of fluid in the forward or "reverse pipe 3! or "33 to a degree exceeding that required for operating the reversing-motor 2'5, "toniove said pisto'nito its circuit closing positionand said piston't/ill be movedtoit-s circuit opening by said 'sprin-gupon a slight reduction insuch-pressure. v

'In operation, i f 'tl'ie' control leverst is in neutral position opening both the "forward and reversepipes 3 i and 33- to "atmosphere, and-as-- a consequence of "whichfboth of the switch devices f5 9-*'and 5 $53 will bein their circuit openin? position'and said le'veris then fla'shedto one or the other swit'c h closed position, as the case may 5 be for effecting reversing operationof the reversing-memes, the-switch device 15901" i ll prei/ ent' lbsing (if thecircuit'thruinagnet 5 until a f ter'the pressure-of fluid in pipe '3 i or $23 4 has been increased to a degree in ex- 'cess 6f that required for operating "the reversing-inotor 25, so that said m'otor vviH first operate to inovethe' rievrser ii to the selected --'position followed by operation Of "the 3 Switch device 159 or l 6 to nee cuit c-los'ing position, whereupon "th in grief, I'ZBWVill-be energized t fle'ctoprthereby of switch 5 to close the traction motor oircuit. V

iOn the 'othe'r if the iev er 'iie is at'the 'the 'co ritfol po'rtion $52 of sTO't Hi! for rig tne' iorward "pipe I e! an for ther'eoy g opr-atio'nbf thesWith'deViCe 159 503135 1 llfit closifig pos itidn, id le'ver'ie movd to -the switch l'o'sd "-psi' 011 11! the 'p0it1On H3 1 or said '"slot, aid s\vitch"dei/ice will operate-to -its-'- circi-1it" opening position eeiore the reversing 'i'nct'crzs-starts t0 'dljr iteandthe' swifich device I60 Will remain in i'ts circuitc enin posinon lint-ii after "operation of ai d reversing" motor -'is com leted, thercby ensuring that the switch 1' evi'c'e' 5 will he in its circuit ope'ning position prior 'to operation of said reversing "motor and cf the motorreverser s and wilrrem n in said position untihafterthe' crsing operation--01 5 'e mcter'andreverser has been completed. "In

ike -r nanrie'r' the switch devices @555 "and. 459 i l cense -the 'sWith dei lce 5 to be in' its'circuit opening position, in changing the direct'ion -oilocomotive move t froin -r verse to To ware-hernia reversing operati'on cf -the nio'tor 6 Sta'rt'sa'nd'untih'after itisc i plated. 111 further preca'ution againstcbtai-n n'desir'e'd i operation above rn 'e ntiene'd, cula'rly in 'case or flash movement of 1' the o 'rators control le'ver S6 fron1 one "end-of the l OnifiZ of the slot it?! to tlfle op'po i'iite Grid "ence at least-to'tl'ie adjacentswitch'clos'ed "1 osi-tion,;under which condition naieunder res- 'r e will be re'leased from one of the pipes "3i "Or 3 3*at the same time as fiuid unfd'r pressure e'ieeenepned to the otheri ejth'ereis pro- "vided in eacii'of-s'aid biiiies w der/dec ine enema he'ck valve [BB-and a fibke iifij-said 'c'heck i a-lye eemg arranged to render 'said"c'hokeefiec five to restrict "new 'of "fluid to "the I resp ctive pipe, While release of fluid under preissure "om espective pipe is ada'pted: to occur-past; said check "va-l've- 'thru' a 120mm ""lication by passing and begreaternow capacity 'than said choke. *With his arrangeinent, rvhen the operator s i'eve'r ss is operated to"1'";e'1e'a'se'"fluidun'der r pressure from either pipe and I? to at the same time suppiy fluid under pressure to the other pipe, the reiatively rapid reduction =in p1'essure in-"thc one pi'pe will ensure operationof the rezpe'c tiveswitch device 1'59 or T55 120 its circuit o'peni p'o'sition oe'fore it is possible to-obtain ii the other pipe-thru the respective choke m sufficient pr'ess'ure to even start-the reversing 'rnctor 2 5 tooperate.

ie m'odification shown I in "Fig' '7 'of the drawing is -thesameas -that shown in :Fig. :6, except that t ietvvo sw'itcn devices I59 and ifiiiiare arranged to control -inparallel the supply of electric current from battery 13? to the manually operative switch device and the operation of this modification to ensure that "the switch deviceWiilbe in its circuit-'opening'position prio'r to-the sta 'rtof operation'of' the motor reverser and until after such operation 'is 0cmpieted -wi"11 be c'le'ar'from the description of the modification shown in Fig. 6 without iurther comment.

The de'vice wtineludi'ng the check-valves [69 'aniichokes Ti'ii'rnalyalso be associated with the stiaicture si-iown' in leigfi'ifif such is desired.

Since"the svvitch devices I59- an'd 168 and the devices tee, which-are necessary merely-to prevent a'n undesired Operati'o'n incident to abnorma] -rnoveznent -'of the operat'cr s control lever iii as above T described, positively-insures that the sWitch-"deVic'e B will be in' its=- circuit opening positio'mprio'r to start of reversing operationof the revc'rser E5 and willremain in said position until-"after operation of sai-d 'reverserhas been t f is -pos'sible -when this 1 structure is used t'o-enzn inatethe finger H25 and the associated parts and 1 control means therefor in "the operators'control valve-device 1E I-Iaving n'o'w described the LinVention What I 40 asnew' a nd 'de'sire to secure by Letters Patentas.

1. -In con ibi-n'ation, a' reversibie Ielectriemotor, rev rising meansior sa-i d "motor movable :to forward and reverse motor circuit closing positions, circ central: means cooperative with lsaid 'rerneans in said forward and 1 reverse positions to' -stab lish said circuit th'rough-said motor, an operator's control device comprising means operable to effect movement ofisaid reversin'g rn'e'ans to its forward and reverse positions; and alsoioperablef to "effect .operationof said 'ircnit"control means toopen: and close said rcir- It 'and means operable automati ally, inrespon e to operation of said operatorsi control device 'to efiect movementofsaid reversing means to either one of' its positions, to delay'rnovement of said' reversing" means with respectztooperation :61? said circuit control meansto open said" circuit, and 'to' delay operation of said circuit control means-to close said circuituntil-"after cessation of movement of said reversing means.

1 2; I=n= combination, areversible electric motor, revcrsi-ng'-=means--for-said-motormovable to forwardand reverse-motor circuit closing positions, circuit control means cooperative with said reversing means'in said'forward and'reverse posi- "tions "to establish said circuit through said motor, an -operators control devi'ce comprising :means oper'able to' efiect movement cfsaidreversing n'i'ea ns to its '-forward--and= reverse positions and 5 alsowoperable to': effect operation of -said circuit -="control 'means to open and a close said circuit, means repel-able automatically, in response to i operation of "said operators control device --to effect-movement of-said reversingmeanstoeither one of its positions, to dela movement of said reversing means with respect to operation of said circuit control means to open said circuit, and means controlled by said reversing means operable to prevent operation of said circuit control means to close said circuit during movement of said reversing means and to effect operation of said circuit control means to close said circuit upon cessation of movement of said reversing means.

3. In combination, a reversible electric motor, reversing means for said motor movable to forward and reverse motor circuit closing positions, circuit control means cooperative with said reversing means in said forward and reverse positions to establish said circuit through said mo tor, an operators control device comprising a lever having forward, reverse and neutral positions, means operable upon movement of said lever to its forward and reverse positions to effect operation of said reversing means to, respectively, its forward and reverse positions, other means operable upon movement of said lever to its neutral position to effect operation of said circuit control means to open said circuit, means associated with said reversing means cooperative with said other means in said forward and reverse positions of said lever to close said circuit, and means for automatically delaying for an interval of time movement of said lever out of said neutral postion to either its forward or reverse position from, respectively, its reverse or forward position.

4. In combination, a reversible electric motor, reversing means for said motor movable to forward and reverse motor circuit closing positions, circuit control means having circuit closing and Opening positions and cooperative with said reversing means to control said motor circuit, an operators control device comprising a lever having forward, reverse and neutral positions, selector means operable by said lever in said forward and reverse positions to effect movement of said reversing means to the corresponding position, means operable by said lever in said forward and reverse positions to effect operation of said circuit control means to its circuit closing position and operable by said lever in its neutral position to effect operation of said circuit control means to its circuit opening position, and other means having circuit opening and closing positions and cooperative with said circuit control means and reversing means to control said motor circuit and operable to its circuit opening position upon operation of said selector means in response to movement of said lever to its neutral position and operable to its circuit closing position upon movement of said reversing means to either its forward or reverse positions.

5. In combination, a reversible electric motor, reversing means for said motor movable to forward and reverse motor circuit closing positions, an operators control device comprising a lever having forward, reverse and neutral positions, means operable by said lever in said forward and reverse positions to effect movement of said reversing means to the corresponding position, a first means having a circuit opening position and circuit closing position for controlling said circuit, means operable by said lever in its forward and reverse positions to effect operation of said first means to its circuit closing position and in its neutral position to effect operation of said first means to its circuit opening position, and

18 circuit control means cooperative with said first means to control said circuit and operable upon movement of said lever to said neutral position to effect opening of said circuit, and upon movement of said reversing means to said forward and reverse positions to effect closing of said circuit.

6. In combination, a reversible electric motor, reversing means for said motor movable to forward and reverse motor circuit closing positions, circuit control means cooperative with said reversing means in said forward and reverse positions to establish said circuit through said motor, an operators control device comprising a lever having a forward position, a reverse position, and a neutral position and means operable upon movement of said lever to its forward and reverse positions to effect movement of said reversing means to the corresponding position, means conditioned with said lever in said forward and reverse positions to delay for a chosen interval of time in said neutral position movement of said lever from either one of said forward or reverse positions to the other, other means operable in said neutral position of said lever to effect operation of said circuit control means to its circuit opening position, and means conditionable in the forward and reverse positions of said reversing means to cooperate with said circuit control means to effect operation of said circuit control means to close said motor circuit.

7. In combination, a reversible electric motor, motor reversing means movable to forward and reverse motor circuit closing positions, circuit control means operable by fluid under pressure to a circuit closing position and upon release of fluid under pressure to a circuit opening position, an operators control device comprising a lever having forward, reverse and neutral positions, means operable upon movement of said lever to its forward and reverse positions to effect movement of said reversing means to the corresponding position, means operable with said lever in its forward and reverse positions to supply fluid under pressure to actuate said circuit control means and operable in said neutral position to release fluid under pressure from said cir cuit control means, blocking means operable by fluid under pressure supplied by said operators control device in said forward and reverse positions to prevent movement of said lever through said neutral position from said forward position to said reverse position, and vice versa, means operable in said neutral position of said lever for releasing fluid under pressure from said blocking means to render same ineffective, and means conditioned in its forward and reverse positions of said reversing means to cooperate with said circuit control means to effect closing of said motor circuit.

8. In combination, a reversible electric motor, reversing means for said motor movable to forward and reverse motor circuit closing positions, a forward pipe, 2. reverse pipe, a fluid reversing motor operable by fluid under pressure in said forward pipe to move said reversing means to said forward position and operable by fluid under pressure in said reverse pipe to move said reversing means to said reverse position, an operators control device comprising a lever having forward, reverse and neutral positions and selector means operable by movement of said lever to said forward position to supply fluid under pressure to said forward pipe and to vent said reverse pipe and operable upon movement of said lever to said reverse position to supply fluid aauaeso 19 under-pressure to said reverse pipe and to vent said forward pipe -and operable in said neutral position of said lever to vent both of said pipes, circuit control means having circuit openingand closing positions and cooperative with said reversing means to control said motor circuit, other means controlled by said leveroperable to a circuit'closing position inresponse tomovement of said'lever to its forwardand reverse positions and to a circuit openingpositionin response to movement of "said lever-to its-neutral position, and means cooperative with said other means to control said circuit control-means and-operative upon a reduction inpressure of fluid in either one of said pipes-to eifect operation of said circuit control-means to-its circuit opening position and operable upon movement of said reversing means.

to-either oneof its forward or reverse positions to eflect operation of "said circuit control -means to its circuit closing position.

9. Iii-combination, a reversible electric motor, reversing means for said motor movable to forward and reversemotor circuit closing positions, a forward-pipe, a reverse-pipe, a fluid-reversing motor operable by-fluid under pressure in said forward pipe to'movesaid reversing means to said forward position and operable by fluid under pressure insaidreverse-pipe to move said reversing means to said reverse position, an operators control device comprising a lever having forward; reverse'and neutralpositions, and selector means operable upon movement of said lever tosaid forwardposition tosupply fluid underpressureto said forward pipe and-to vent said reverse pipe and operable upon movement of said lever to said reverse position to supplyfluid under pressure to said reverse pipe and to vent -:said forward pipe and operable in said neutral position of said lever to vent both of-said pipes, circuit control means having circuit opening and closing positions and cooperative with said reversing means to controlsaid motor circuit, a magnet operable upon energization to eifect movement of said circuit control means to a circuit closing-positionand upon deenergization to efiectmovement of thecircuit control means to its circuit opening position, and means for controlling the circuit thru said magnetcomprising a switch device, means operablebysaid lever in its forward and reverse positions to-ellect operation of said switch device to acircuit closing position and operable by said lever in its neutral position to effect operation of said switch device to a circuit opening position, switch means connected in series with said switch device and operable upon venting offluid under pressure from either one of said pipes to-open'the circuit thru said magnet and upon supply of fluid under pressure to either one of said DiDESiOOlOSB'lJhG circuit thru said magnet, and circuit control means arranged to control thecircuit thru saidmagnet in series with-said switch device and switch means andassociated with'said reversing means and operable-inthe forward and reverse positions thereof to acircuit closing position-and operable whenout-of saidforward and'reverse positions to a'circuit openingposition;

10. -In combination; a reversible electric motor, reversing means for said motor movable to for- Ward-"and reverse motor circuit closingpositions, a forward pipe, a'reverse pipe, a fluid reversing motor operableby-- fluid-under pressure in said forward' pipe to "move said I reversing means --to said'forward position and operable by fluid under pressure in-*said-reverse' pipe to move said reto forward position to supplyfiuid under pressure to said "forward pipe and to vent said reversepipe and operable upon movement of said lever to said reverse-position to supply fluidunden pressure to said reverse pipe and to vent said for,

ward pipe and operable in said neutral position-of said lever to vent both of said pipes, cir-cuit'c0ntrol means having circuit opening andz cl'osing positions and cooperative With said I reversing means to control said motor circuit, a circuit control motor cperableby fluid under pressure to efiect movement of said circuit control meansto its circuit closing position and upon releaserof under pressure to its circuit opening 'post tion; means controlled by saidoperatorscontrol device and reversing means for control ling the supply fluid under pressure'to said circuit control motor ancl'operable to eife'ct' such suppiv With both said lever and reversing means, in eitherv their forward or. reverse position andto, prevent such supply upon movement of saidllever; or". either its forward position or its :reverse, position toits neutral position-When'said revers-- ing means is ina position. other than corresponding to that of said lever.

In combination, a reversible electric motor, reversingmeans for said motormovable to fore ward-and reverse. motor-circuit closing positions, a forward pipe, a reverse pipe, a fluid reversing; motor operable by fluid under pressure sin said forward :pipe to move said reversing meanssto; saidforward position and operable by-fiuid under pressure in said reverse pipevto move said reversing means to saidreverse IJOSitlOl'lpH-l'l cperators; control devicecornprising a lever havingaforwardw reverse and neutral positions, and selectormeana operable: upon movement ofsaid lever to said for.-: ward positionv to supplyafluid under -:pressure to said forward pipe andxto vent saidrreverse pipeand operable upon movement 'offisaidizleverst0: said reverse position to supply fluid-under pres-x sure tosaid reverse pipe and ,to'vent saidiforwardx pipe andioperable' in saidineutraliposition:of said: lever to vent -.both of said :pipes; circuit control means, having ucircuit opening and closing posl. tions and cooperative with said reversing means: to control said motor circuit, a. circuit:contro'l= motor operable by fiuid under pressure toeefioct' movement of said circuit control means to' a clr' cuit closing position and upon release of fluid under pressure to a circuit opening position, on electro-magnet device operative 'upon-energization to establish a communication for supplying fluid under pressure to said circuit control motor and operable upon deenergizationtoclose-said communication and to vent fluid under pressure from said circuit control motor; sin-energizing circuit f or said magnet comprising-a first-switch means for opening and closingsaid'energizingcircuit, means controlled bvsaid lever operable upon movement thereof to said neutral positionpressure to the other pipe to a circuit closing position, and contact means associated with said reversing means controlling said energizing circuit in series with said first and other switch means and operative in said forward and reverse positions of said reversing means to close said energizing circuit and when out of said forward and reverse positions of said reversing means to open said energizing circuit.

12. In combination, a reversible electric motor, reversing means for said motor movable to forward and reverse motor circuit closing positions, a forward pipe, a reverse pipe, a fluid reversing motor operable by fluid under pressure in said forward pipe to move said reversing means to said forward position and operable by fluid under pressure in said reverse pipe to move said reversing means to said reverse position, an operators control device comprising a lever having forward, reverse and neutral positions, and selector means operable upon movement of said lever to said forward position to supply fluid under pressure to said forward pipe and to vent said reverse pipe and operable upon movement of said lever to said reverse position to supply fluid under pressure to said reverse pipe and to vent said forward pipe and operable in said neutral position of said lever to vent both of said pipes, circuit control means having circuit opening and closing positions and cooperative with said reversing means to control said motor circuit, a circuit control motor operable by fluid under pressure to eifect movement of said circuit control means to a circuit closing position and upon release of fluid under pressure to a circuit opening position, an electro-magnet device operative upon energization to establish communication for supplying fluid under pressure to said circuit control motor and upon deenergization to close said communication and to vent fluid under pressure from said circuit control motor, a switch device for controlling energization and deenergization of said electro-magnet device, means operable by said lever in its forward and reverse positions to effect operation of said switch device to eflect energization of said electro-magnet device and operable upon movement of said lever to said neutral position to effect operation of said switch device to effect deenergization of said magnet device, and means including said reversing motor operable to supply fluid under pressure to said magnet device upon movement of said reversing means to its forward and reverse positions and to cut off the supply of fluid under pressure to said magnet device upon venting of fluid under pressure from said reversing motor through either one of said pipes.

13. In combination, a reversible electric motor, reversing means for said motor movable to a forward position upon supply of fluid under pressure to a forward pipe and to a reverse position upon supply of fluid under pressure to a reverse pipe, a third pipe, an operators control device comprising .a lever having forward, reverse and neutral positions, means operable upon movement of said lever to its forward position to supply fluid under pressure to said forward and third pipes and to vent said reverse pipe and operable by said lever in said reverse position to supply fluid under pressure to said reverse and third pipes and to vent said forward pipe and operable in said neutral position to vent all of said pipes, circuit control means adapted to cooperate with said reversing means in said forward and reverse positions of said reversing means to establish an electric circuit thru said motor, and interlock means controlling said circuit control means and operable upon venting fluid under pressure from said third pipe and from either said first or second pipe to effect operation of said circuit control means to open said motor circuit and upon supply of fluid under pressure to said third pipe and to either said second or first pipe and upon movement of said reversing means into either its forward or its reverse position to effect operation of said circuit control means to close said motor circuit.

14. In combination, a reversible electric motor, reversing means for said motor movable to a forward position upon supply of fluid under pressure to a forward pipe and to a reverse position upon supply of fluid under pressure to a reverse pipe, a third pipe, an operators control device comprising a lever having forward, reverse and neutral positions, means operable upon movement of said lever to its forward position to supply fiuid under pressure to said forward and third pipes and to vent said reverse pipe and operable by said lever in said reverse position to supply fluid under pressure to said reverse and third pipes and to vent said forward pipe and operable in said neutral position to vent all of said pipes, switch means arranged to be operated by fluid under pressure to cooperate with said reversing means in its forward and reverse positions to establish an electric supply circuit thru said motor and upon release of fluid under pressure to disestablish said circuit, an electro-magnet means operable upon energization to establish a fluid pressure supply communication to said switch means and upon deenergization to disestablish said communication and to release fluid under pressure from said switch means, a second switch means for controlling an energizing circuit thru said electro-magnet device and movable to a circuit closing position upon supply of fluid under pressure to said third pipe and to a circuit opening position upon release of fluid under pressure from said third pipe, a third switch means controlled by pressure of fluid in said forward pipe and movable to a circuit closing position upon supply of fluid under pressure thereto and to a circuit opening position upon release of said fluid pressure, a fourth switch means controlled by pressure of fluid in said reverse pipe and movable to a circuit closing position upon supply of fluid under pressure thereto and to a circuit opening position upon release of fluid under pressure from said reverse pipe, and circuit closing means associated with said reversing means operable in the forward position thereof to connect said third switch means in series with said second switch means and in said reverse position to connect said fourth switch means in series with said second switch means, said third or fourth switch means in its circuit closing positions being effective to supply electric current to said reversing means for supply through said second switch means to said electr c-magnet device for effecting energization thereof.

15. In combination, a reversible electric motor, reversing means for said motor movable to a forward position upon supply of fluid under pressure to a forward pipe and to a reverse position upon supply of fluid under pressure to a reverse pipe, a third pipe, an operators control device comprising a lever having forward, reverse and neutral positions, means operable upon movement of said lever to its forward position to supply fluid under pressure to said forward and third pipes and to vent said reverse pipe and operable aaaopeo;

Zoli by. aid Clever-2inisaidsreversa positionutoxsupply fisidiunder pressure tox-said lreversesandfithirdc es andctouventi said: 'forward-pipeland foper-able: inasaidzneutral position to. ventJalLof: said pipes-,=l. a ,.pneumatic switch: movable to s acircuit closingl- 52 position by luid :underipressureto cooperate with" said reversing means in said forward and reverse position: to establishan electric supply circuit 11111 11: said motor and operable; upon release of fluid under pressure toadis'establish 1 said circuit, arr electro-magnet device operable upon energiz'atiom to establish a fluid pressure supply communicationto said-pneumatic switch; andoperable upon 1 deenergization-to disestablishsaid communication audio-release fluid under pressure 1 from :said' 15; pneumatic switch; another-pneumatic switc'hcon tr'o-ile'd'bypressure of fluid in said-third pipe and vI operable-upon supply of-fluid under pressure to saidthird pipe to'eff'eot energization of said ele'ctro-magnetdeviceand upon release of fluidunder g pressure ironr-said third pipe-to-effect deenergizati'onof sa-id electr c-magnet device; and means-for controlling the supply of fluid under pressure-to saidelectro-magnet device foroperatingthe firstnamed switch and operable upon release of fluid underpressure from either-said forward-pipe or-- said-reverse" pipe-to release fluid under pressure a from the first named pneumatic switch and operabieto supply-fluid under pressure to said first named-pneumaticswitch insaid forward-and 30,1 reverse pos ions of-said reversing means and to prevent said-supply during movement between sa'idforward and reverse positions:

16: In combination;a-reversible electric'motor,

a forward pipe-,=- a-reverse=pipe,- fluid-pressure actuated reversing-means for 'sa'id'motoroperable upon supply of fluid under pressure to said for- Wa d pipe to a forward motor circuit closing position and 'upon supply of fluid unde'rpressure to said reverse pipe to a -reverse motorcircuit 40 closing position; circuit" control means having "a circuit opening. position and a circuit closing" positiomand adapted ;;to cooperate witlrsaid re-- versing means in said. forward'and reverse 'posi ticns "to' close "said "motor circuit, air-operators L control device comprising a 'leverhavingforward; reverse and neutral positions-and meansoperable upon movement of said lever to sai'cl'forward position to supply fluid under? pressure to'said forward pipe and to vent said reverse pipe; and operable upon movement of, said'lever tosai-d" reverse position to supply fluid under pressure to: said reverse pipe and to ventxsaid forward and operable in neutral position of said lever to: ventnbothof saidjpipes, and means controlled by' pressure of fluid .in said pipes operable ,automati cally upon movement of said lever from either saidj forward or reverse'position to respectively said;reverse :or forward position "to effect opera-- tion' of said .circuit' control "means to its circuit" opening positionprior to operation of saidgrevers= ingimeans and to its circuit closingpositionsub sequent to" operation of said reversing means:

17. In combination, a reversibleelectricmotor; aforward-pipe; a reverse pipe, fluid-pressure 6533 actuated reversing means-for said motor operable upon suppiy of fluid under pressure-to-saidfor ward-pipe-to a forward-motor circuit closing pcsiticnand upon supply of fluid under pressure to said reverse pipe to a reverse motor circuit 1 clos 7 0: ing position, circuit control-means having -a circuit --openingposition-aud o; circuit closing-posh ti'on and-adapted to cooperate iwithsaid reversing A means in saidforwardand reverse positionsq to: close said motor' circuit, 1 an operators' control j devicecomprising adererhavinm forward, reverse and :neutra-l fpositi'ons; and means operablexupon .l movement r isaidllever to said forward position" tochsupplyzfiuid :underpressure to said: forward: pipe andiftor vent "said reverse pipe, and: operable upon movement of "saidlever'tosaid reverseposition-to-supply fluidunder pressure to said reversepipe and to-rvent said forward pipe, and operable in neutral position of said lever to vent botn 'of said-pipes; a first fluid pressureresponsiVemeans connected to said forwardpipe, a-second-=fifiid f pressuraresponsive means connected to said reverse: pipe, said first and second fluid pressureresponsive -1neans operatingupon ares-condom pressure of iiuidin the respective pipe andsupplvof fidid- 'und-r pressure to theother-pipe- -upon" movement of said lever fromeither saidiorward positionor reverse -positionto respectively saidreverse'or-=forvvard-posi-tion to eiTect operation of said circuit-control means toopen said motorcircuit ahead-of operation of said reversing-means and toclose said motor circuit subsequent tooperation'oi' said reversing means;

18. In -'combination';areversible electric motor;- aforward pipe, a'reverse pipe, fluid pressure ac tuated reversing means for-said motor operable upon" supply 'of-fluid under pressure to said for ward pipe too-forward motor circuit closingposi tic- -and *upon supply of-fluid"under-pressure to said reverse pipe to-areverse motor circuit cl0s= ing position; circuit controlmeans having a: cir= cult opening position and-a circuit closing; posi-- tion and adapted to cooperate with said reversing meansin said forward and reverse positionstoclose'saidmotor circuit, anoperator s control device-comprising a driver-"having forward;- reverse and "neutral positions,- andmeans operable upon-'- movement of said "lever to said forward position to supply fluid under pressure tosaid'forward pipe and-to-vent said reverse pipe, and-operable -upon-- movement of saidlever to-said reverse position'tosupply' fluid under pressure to said reverse pipe 7 and to-"vent said forward pipe, and-operable in" neutralposition-ofsaid'lever to vent both of said pipes,a first fluid pressure responsive means 'con-' necteolto -said forward pipe; a second-fluid pressure-responsive means connected to said reverse pipe;---said-first and second fluid pressure responsive means I operating-upon a reductionin pressure offluid in therespective pipe and supply offiuid under pressure-to theother pipe-upon move-- merit- 0f said le'verfrom either-said 7 forward posi tionor *reverse positio torespectively said re= verse ar-forward position :to effect operation :of said circuitcontrol means to open saidmotor cir cuit aheadofioperation of saidreversing means: and tolicloseisaid motor circuit. subsequent .tooperation: of. *said reversingrmeansa means. -for re? strictinggsupply ofifiuid under pressure to said1 first zandisecondzfiiiidizpressure responsive :means: for saidpperatoris Icontrol; device; andvmeans-providingyfor :venting of fluidunder pressure at :a more: r aid-rate fromsaid first and second efluid: pressureresponsivemeansby opera ionpfsaid ope eratoris' control device.

19; Iniacombmationu a :reversible electric motor,-:" reversing means-for saidrmotor;moVa;ble:-to fora Wardrand reverse motor circuit: :closing positions circuit control means having: circuit closing and 1 opening apositions and: cooperative .With said re:-; versingzmeans :to control saidiimotorscircuit; an; operatons'control:deviceicomprising :a .1ever;hav-; ing forwardsand reverse positions, meansrespon; I sive tomovement: ofsaidlever to said-fortwardandi reverses positionsztoueffect i-movement'pf:said ree..

versing means to the corresponding position, and other means operable upon movement of said lever from said forward position to said reverse position, or vice versa, to effect operation of said circuit control means to its circuit opening position ahead of operation of said reversing means, and to its circuit closing position subsequent to operation of said reversing means.

20. A control apparatus for controlling the speed of an engine and the supply of electric current from generator driven by said engine to an electric motor comprising in combination, a speed control pipe, speed regulating means for said engine operable to vary the speed of said engine in proportion to the pressure of fluid in said pipe, reversing means for said motor having forward and reverse current supply positions, circuit control means cooperative with said reversing means in its forward and reverse positions to close an electric current supply circuit from said generator to said motor, an operators control device having forward and reverse positions for supplying fluid under pressure to said pipe and having a neutral position for releasing fluid under pressure from said pipe, means operable in said forward and reverse positions of said operators control device to effect movement of said reversing means to the corresponding position, and means operable upon a reduction in pressure of fluid in said pipe in response to movement of said operators control device to said neutral position to effect operation of said circuit control means to open said supply circuit to said motor and operable upon supply of fluid under pressure to said pipe with said reversing means in either said forward or reverse position to effect operation of said circuit control means to close said supply circuit.

21. A control apparatus for adjusting a speed control element on an engine and for controlling the flow of electric current from a generator driven by said engine to an electric motor, said element having an engine idle position, a stop position, and a zone of movement for varying the speed of said engine in proportion to the extent of movement out of said idle position, said apparatus comprising in combination, a control pipe, speed regulating means operable upon supply of fluid under pressure to said pipe to adjust said speed control element out of said idling position and operable upon release of fluid under pressure from said pipe to adjust said speed control element to said idling position, fluid actuated reversing means movable to either a forward or a reverse position for controlling flow of electric current from said generator to said motor to effect operation of said motor in either one direction or in the opposite direction, a source of fluid under pressure, an operators control device for establishing communication between said source of fluid under pressure and said speed control pipe, and said reversing means, a manually adjustable valve in the communication between said source of fluid pressure and said operators control device and having an open position for establishing the communication between said source and said operators control device and having a closed position for closing such communication and for opening to atmosphere the fluid pressure supply connection to said operators control device, means operable by fluid under pressure to effect movement of said speed control element to said stop position, said manually adjustable valve in its said open position releasing fluid under pressure from the last named means and in its closed position supplying fluid under pressure thereto.

22. A control apparatus for controlling the speed of an engine and the supply of electric current from a generator driven by said engine to an electric motor comprising in combination, a speed control pipe, speed regulating means for said engine operable to vary the speed of said engine in proportion to the pressure of fluid in said pipe, reversing means for said motor having forward and reverse current supply positions, circuit control means cooperative with said reversing means in its forward and reverse positions to close an electric current supply circuit from said generator to said motor, an operators control device having forward and revers positions for supplying fluid under pressure to said pipe and having a neutral position for releasing fluid under pres- I sure from said pipe, means operable in said forward and reverse positions of said operators control device to effect movement of said reversing means to the corresponding position, and manually operative means for also effecting operation of said circuit control means to open said supply circuit.

ARTHUR G. LARSON. 

